IMCIS02
IMCIS02
IMCIS02
1)PLC梯形圖中的某些編程元件沿用了繼電器這一名稱，如輸入繼電器、輸出繼電器、內(nèi)部輔助繼電器等，但是它們不是真實的物理繼電器(即硬件繼電器)，而是在軟件中使用的編程元件。每一編程元件與PLC存儲器中元件映像寄存器的二個存儲單元相對應。以輔助繼電器為例，如果該存儲單元為0狀態(tài)，梯形圖中對應的編程元件的線圈“斷電”，其常開觸點斷開，常閉觸點閉合，稱該編程元件為0狀態(tài)，或稱該編程元件為OFF(斷開)。該存儲單元如果為1狀態(tài)，對應編程元件的線圈“通電”，其常開觸點接通，常閉觸點斷開，稱該編程元件為l狀態(tài)，或稱該編程元件為ON(接通)。
2)根據(jù)梯形圖中各觸點的狀態(tài)和邏輯關(guān)系，求出與圖中各線圈對應的編程元件的ON/OFF狀態(tài)，稱為梯形圖的邏輯解算。邏輯解算是按梯形圖中從上到下、從左至右的順序進行的。解算的結(jié)果，馬上可以被后面的邏輯解算所利用。邏輯解算是根據(jù)輸入映像寄存器中的值，而不是根據(jù)解算瞬時外部輸入觸點的狀態(tài)來進行的。
3)梯形圖中各編程元件的常開觸點和常閉觸點均可以無限多次地使用。
4)輸入繼電器的狀態(tài)唯一地取決于對應的外部輸入電路的通斷狀態(tài)，因此在梯形圖中不能出現(xiàn)輸入繼電器的線圈。
備貨，備貨，降降降，火火火，火火火……
備貨，備貨，降降降，火火火，火火火……
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